[機統] second order density functions?
http://en.wikipedia.org/wiki/Stationary_process#Second-order_stationarity
我想要了解一下second order stationarity,
可是我看不懂頁面裡面的"second order density function"指的是什麼。
原文:A process is second order stationary if the first and second order density
functions satisfy ...
我只知道second moment. 不知道什麼是second order density function
還是有大大推薦哪裡有解釋second order stationarity較好的網頁嘛?
感激
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